improve datetime merge

Author: pwelter34

src/FluentCommand.SqlServer/Merge/DataMergeGenerator.cs

@@ -461,8 +461,8 @@ private static string GetValue(object value)
         return value switch
         {
             string stringValue => stringValue,
-            DateTime dateTimeValue => dateTimeValue.ToString("u"),
-            DateTimeOffset dateTimeOffset => dateTimeOffset.ToString("u"),
+            DateTime dateTimeValue => dateTimeValue.ToString("yyyy-MM-dd HH:mm:ss.fff"),
+            DateTimeOffset dateTimeOffset => dateTimeOffset.ToString("yyyy-MM-dd HH:mm:ss.ffffffzzz"),
             byte[] byteArray => ToHex(byteArray),
             bool boolValue => boolValue ? "1" : "0",
 #if NET6_0_OR_GREATER

test/FluentCommand.SqlServer.Tests/Snapshots/DataMergeGeneratorTests.BuildMergeDataTypeTests.verified.txt

@@ -2,8 +2,8 @@
 USING
 (
     VALUES
-    (1, 'Test1', 0, 2, 200, 200.2, 300.35, 456.12, '2024-05-01 08:00:00Z', '2024-05-01 14:00:00Z', '00000000-0000-0000-0000-000000000000', '01:00:00', '2022-12-01', '01:30:00.000000', 0, 2, 200, 200.2, 300.35, 456.12, '2024-04-01 08:00:00Z', '2024-04-01 14:00:00Z', '00000000-0000-0000-0000-000000000000', '01:00:00', '2022-12-01', '01:30:00.000000'), 
-    (2, 'Test2', 1, 3, 400, 600.2, 700.35, 856.12, '2024-05-01 08:00:00Z', '2024-05-01 14:00:00Z', '00000000-0000-0000-0000-000000000000', '02:00:00', '2022-12-12', '06:30:00.000000', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
+    (1, 'Test1', 0, 2, 200, 200.2, 300.35, 456.12, '2024-05-01 08:00:00.000', '2024-05-01 08:00:00.000000-06:00', '00000000-0000-0000-0000-000000000000', '01:00:00', '2022-12-01', '01:30:00.000000', 0, 2, 200, 200.2, 300.35, 456.12, '2024-04-01 08:00:00.000', '2024-04-01 08:00:00.000000-06:00', '00000000-0000-0000-0000-000000000000', '01:00:00', '2022-12-01', '01:30:00.000000'), 
+    (2, 'Test2', 1, 3, 400, 600.2, 700.35, 856.12, '2024-05-01 08:00:00.000', '2024-05-01 08:00:00.000000-06:00', '00000000-0000-0000-0000-000000000000', '02:00:00', '2022-12-12', '06:30:00.000000', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
 )
 AS s
 (